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8/27/2005

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Migration Monitoring at TTPBRS-August 19-25

Cooler temperatures and northerly winds seem to be appropriate conditions for "fallouts" during autumn migration at Tommy Thompson Park. The past week was a record setting one for the research station as numbers of migrating warblers in particular were unusually high for this time of year. August 19 was a washout as rain and high winds forced cancellation of fieldwork. High south winds from August 20-21 probably limited overnight migration as daily banding totals were in the teens. New arrivals during the two days included Sharp-shinned Hawk, Red-eyed Vireo, Veery and Swamp Sparrow. A cooling trend on the 22nd along with winds shifting to north brought in more activity as 37 birds were banded on the 22nd. Empidonax flycatchers and warblers were dominant on the day while 2 Hermit Thrushes banded was noteworthy (early). A "fallout" occurred on the 23rd as 17 species of warbler were recorded and 73 birds in total were banded. Banding totals of Veery (8), Magnolia (15), Chestnut-sided (6), Black-and-white (5) and American Redstart were significant. The tall cottonwoods towards the tip were absolutely alive with birds, mostly Myrtles (110 estimated)! A continuation of the weather pattern resulted in another strong passage of migrants on the 24th as 63 birds were banded. The 25th was equally impressive as American Redstart, Myrtle Warbler, Nashville and Magnolia Warbler were detected in higher than "normal" concentrations. The season's first Black-billed Cuckoo was observed on this day. Data from previous fall seasons at TTPBRS indicate that the highest single-day banding total for August was 45! This record was broken each day from the 23rd to the 25th of this year. Another cold front is forecasted for the middle of next week so hopefully we will have lots to report next week.....
 
Note: The TTPBRS Sightings Board is updated on a daily basis so check here for regular daily banding totals and new arrivals. The site also features the occasional photo essay. This week featured a write-up on a case of diet induced plumage variation in a Baltimore Oriole captured at the station. http://tboweb.blogspot.com
 
HIGHLIGHTS
Banding
Aug 22
6-Traill's Flycatcher
2-Hermit Thrush (early)
2-Tennessee Warbler
Aug 23
8-Veery
3-Swainson's Thrush
15-Magnolia Warbler
2-Bay-breasted Warbler
5-Black-and-white Warbler
1-Slate-coloured Junco (record early date, September 18 last year)
Aug 24
2-Philadelphia Vireo
9-American Redstart
Aug 25
2-Cape May Warbler
2-Mourning Warbler
 
Observations
Aug 20
3-Canvasback
1-Sharp-shinned Hawk
Aug 21
19-Eastern Kingbird
6-Purple Martin
1-Blackburnian Warbler
Aug 22
1-Peregrine Falcon
1-Scarlet Tanager
Aug 23
2-Green Heron (2nd record for TTPBRS)
10-Green-winged Teal
14-Chestnut-sided Warbler
23-Magnolia Warbler
13-Black-and-white Warbler
Aug 24
1-Eastern Phoebe
6-Red-breasted Nuthatch
2-Black-throated Green Warbler
8-Wilson's Warbler
Aug 25
1-Cooper's Hawk
1-Black-billed Cuckoo
3-Great-crested Flycatcher
8-Red-eyed Vireo
115-Myrtle Warbler (~90% moulting juveniles and 10% moulting adults banded during the week)
26-American Redstart
 
Season Banding Total
05-520
04-463
 
Season Species Total
05-109
04-99